The effect of diamagnetic drift on motion of the dayside magnetopause reconnection line
The effect of diamagnetic drift on motion of the dayside magnetopause reconnection line
Magnetic reconnection at the magnetopause occurs with a large density asymmetry and for a large range of magnetic shears. In these conditions, a motion of the X line has been predicted in the direction of the electron diamagnetic drift. When this motion is super Alfvenic, reconnection should be suppressed. We analysed a large data set of Double Star TC-1 dayside magnetopause crossings, which includes reconnection and nonreconnection events. Moreover, it also includes several events during which TC-1 is near the X line. With these close events, we verified the diamagnetic suppression condition with local observations near the X line. Moreover, with the same close events, we also studied the motion of the X line along the magnetopause. It is found that, when reconnection is not suppressed, the X line moves northward or southward according to the orientation of the guide field, which is related to the interplanetary magnetic field BY component, in agreement with the diamagnetic drift.
6129-6136
Trenchi, L.
565a6c2f-9b87-4a3a-a453-ff7cfecbb266
Marcucci, M.F.
65f2a3fa-ed12-4083-b064-21a0cbd47971
Fear, R.C.
8755b9ed-c7dc-4cbb-ac9b-56235a0431ab
3 August 2015
Trenchi, L.
565a6c2f-9b87-4a3a-a453-ff7cfecbb266
Marcucci, M.F.
65f2a3fa-ed12-4083-b064-21a0cbd47971
Fear, R.C.
8755b9ed-c7dc-4cbb-ac9b-56235a0431ab
Trenchi, L., Marcucci, M.F. and Fear, R.C.
(2015)
The effect of diamagnetic drift on motion of the dayside magnetopause reconnection line.
Geophysical Research Letters, 42 (15), .
(doi:10.1002/2015GL065213).
Abstract
Magnetic reconnection at the magnetopause occurs with a large density asymmetry and for a large range of magnetic shears. In these conditions, a motion of the X line has been predicted in the direction of the electron diamagnetic drift. When this motion is super Alfvenic, reconnection should be suppressed. We analysed a large data set of Double Star TC-1 dayside magnetopause crossings, which includes reconnection and nonreconnection events. Moreover, it also includes several events during which TC-1 is near the X line. With these close events, we verified the diamagnetic suppression condition with local observations near the X line. Moreover, with the same close events, we also studied the motion of the X line along the magnetopause. It is found that, when reconnection is not suppressed, the X line moves northward or southward according to the orientation of the guide field, which is related to the interplanetary magnetic field BY component, in agreement with the diamagnetic drift.
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Accepted/In Press date: 11 July 2015
e-pub ahead of print date: 18 July 2015
Published date: 3 August 2015
Organisations:
Astronomy Group
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Local EPrints ID: 394037
URI: http://eprints.soton.ac.uk/id/eprint/394037
ISSN: 0094-8276
PURE UUID: 04235e7b-be08-4e92-9bf6-aca380408395
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Date deposited: 11 May 2016 08:29
Last modified: 15 Mar 2024 03:49
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Author:
L. Trenchi
Author:
M.F. Marcucci
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